/*画板css*/
#drawing-board{
	overflow: hidden;
	position: relative;
	min-width: 300px;
	min-height: 550px;
	background-image: url("img/board-bg.gif");
	border: 1px solid #ddd; 
}
#backup-board{
	display: none;
}
.board{
	position: absolute;
	background-color: #fff;
	border: 1px dashed #ddd;
	min-width: 300px;
	min-height: 100px;
	height:100%;
	width:100%;
	overflow: hidden;
}